After seeing an NGC unpacking video in YouTube from a collector with plenty of nice and old coins, the information I got from it was that if you submit your coins for conservation at NCS before being graded at NGC, it could tilt the balance towards your coin being graded as "Cleaned." He submitted 5 coins for NCS conservation services, and I believe 3 or 4 came back as cleaned. I thought that the whole idea of using all the services under the umbrella of NGC was precisely because it would help, not affect your submissions. What is the truth in that? I ask because I was thinking of having my coins be checked by NCS before being graded in the hopes of getting them as perfect as possible to achieve the highest grade; however, if there is a chance it will result in a "cleaned" grade, then that's a deal killer right there.
In lieu of my previous question, do you recommend using NCS to inspect and conserve if needed brand new Silver Proof coins from Mints? Do you think, or have any experience, in this being beneficial or the opposite? I am considering this because since they are all still not graded, it would be easier and cheaper to do any conservation required now; however, they are brand new. All suggestions and advise will be appreciated.
Thanks for your help.